Fire storage combined primary frequency modulation control method and system considering frequency space-time difference

Abstract

The application discloses a kind of fire storage combined primary frequency modulation control method and system considering frequency space-time difference, belong to electric power system active balance and primary frequency modulation control technical field.The method of the present application comprises: determining the position of the monitoring master station in power grid, and based on the position of the monitoring master station, the energy storage power station of fire storage combined regulation resource station in power grid is classified;According to the characteristic quantity obtained by the monitoring master station node, the power grid fault is perceived, when the power grid fails, based on the frequency variation characteristic of the generator of monitoring master station, the disturbance size is evaluated, while the available capacity of energy storage power station is evaluated, and the evaluation result is obtained;According to the evaluation result, according to the preset issuing logic, the primary frequency modulation control instruction is issued to the energy storage power station, and the energy storage power station is controlled based on the primary frequency modulation control instruction.The implementation of the present application overcomes the limitation of synchronous machine primary frequency modulation response delay, and the adjustment speed is faster to reach millisecond level.

Description

Technical Field

[0001] This invention relates to the field of active power balance and primary frequency regulation control technology in power systems, and more specifically, to a method and system for combined thermal power and energy storage primary frequency regulation control that takes into account the spatiotemporal differences in frequency. Background Technology

[0002] As the penetration rate of renewable energy sources such as photovoltaics and wind power in the power system continues to increase, the moment of inertia of synchronous machines is decreasing, leading to a continuous rise in the demand for system frequency regulation. On the one hand, wind and photovoltaic resources are constrained by geographical and meteorological conditions, resulting in significant differences in their penetration rates across different regions of the power grid. On the other hand, due to the uneven spatial distribution of power supply structures and unit grid connection characteristics, the moment of inertia in different regions of the power system exhibits non-uniform characteristics. Therefore, when disturbances occur at different nodes, the frequency response characteristics (such as the rate of change of frequency RoCoF and the lowest frequency point) of each node in the power grid also differ. The larger the scale of the power system grid and the higher the penetration rate of new energy sources, the more uneven the inertia distribution, and the greater the frequency differences between nodes. Primary frequency regulation control based on network-wide frequency consistency cannot meet the frequency regulation needs of different regions. Power in remote areas needs to be transmitted through long-distance transmission channels to compensate for the power deficit at disturbed nodes. Relying on long-distance transmission channels to transmit remote reserve power to compensate for the power gap at disturbed nodes not only results in lower operational economic indicators but also increases the active power transmission losses of the power grid. Energy storage power stations, as a flexible power regulation resource, can rapidly absorb or release electrical energy, meeting the frequency regulation needs of specific areas of the power grid. Current technological limitations include: Current primary frequency regulation methods typically assume synchronous frequency changes across the entire system, neglecting the inconsistencies and regional differences in frequency fluctuations at different nodes of the power grid under fault disturbances. When significant active power disturbances occur in areas with weak inertia and frequency regulation, the frequency at the disturbance point drops or rises rapidly, potentially exceeding the safety threshold for low-frequency load shedding and high-frequency generator tripping within a short period, causing nearby units to disconnect from the grid or experience low-frequency load shedding events.

[0003] Grid frequency fluctuations require millisecond-level response, while traditional thermal power units have a large inertial response delay. When large active power disturbances occur in areas with weak synchronous machine inertia and frequency regulation, the delay of thermal power units makes it impossible to quickly compensate for the power deficit.

[0004] The primary frequency regulation strategy based on frequency consistency cannot take into account the power compensation differences between the near and far regions of the disturbance, which can cause active power to flow across regions and may lead to other stability problems. Summary of the Invention

[0005] To address the above problems, this invention proposes a combined primary orientation control method for fire and energy storage systems that takes into account frequency spatiotemporal differences, comprising: The location of the monitoring master station in the power grid is determined, and the energy storage power stations of the regulating resource stations in the power grid are classified based on the location of the monitoring master station; Power grid fault perception is performed based on the characteristic quantities obtained from the monitoring master station node. When a power grid fault occurs, the magnitude of active power disturbance in the monitoring area is assessed based on the frequency change characteristics of the generators at the monitoring master station. The available regulation capacity of the classified energy storage power stations is assessed, and the assessment results are obtained. Based on the evaluation results and according to the preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, and the energy storage power station is controlled based on the primary frequency regulation control command.

[0006] Optionally, the location of the monitoring master station can be determined based on the network topology of the power grid, the distribution of synchronous machines, and the distribution of energy storage power stations.

[0007] Optionally, based on the location of the monitoring master station, the energy storage power stations of the regulating resource stations in the power grid are classified, including: Based on the location and voltage level of the joint regulation and control resource station, energy storage power stations are classified and their respective monitoring master stations are identified. The affiliation between the monitoring master station and the energy storage power station is determined based on the electrical distance between the energy storage power station and the monitoring master station, and the energy storage power station substations are sorted according to their electrical distance from the monitoring master station.

[0008] Optionally, power grid fault detection can be performed based on the feature quantities obtained from the monitoring master station node, including: Based on characteristic quantities and typical electrical quantity patterns of power grid fault types, short-circuit faults and active power surge faults in the power grid can be distinguished by threshold judgment, feature matching, or logical criteria.

[0009] Optionally, the fault location can be determined based on the voltage and current drop and frequency variation characteristics of the fault node.

[0010] Optionally, depending on whether the voltage or current at the fault node is a step change, if it is not a step change, then an active power disturbance fault occurs in the power grid.

[0011] Optionally, an available capacity assessment can be performed on the categorized energy storage power stations, including: If a short-circuit fault occurs in the power grid, the monitoring master station will not issue any active power release or absorption commands; If an active power disturbance fault occurs in the power grid, the State of Charge (SOC) of the energy storage station is obtained, and the state of the energy storage station is determined based on the SOC. Among them, when the SOC of the energy storage power station is 0%~10%, it is in a state where discharge is prohibited; When the SOC of an energy storage power station is 10% to 90%, it is in a state where it can be charged and discharged. When the SOC of the energy storage power station is 90%~100%, charging is prohibited. If the unbalanced power deficit in the near zone of the monitoring master station is: in, For unbalanced power, Adjustable power; Where: N is the number of generators monitored by the main station, H Gi Here, f is the rated kinetic energy of the generator, and f is the frequency. like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... : like If the value is less than 0, then the energy storage power station needs to absorb active power. The available active power capacity of the energy storage power station is calculated as follows: like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

[0012] Optionally, according to a preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, including: like >0, the power deficit in the region is The system issues active power release commands to energy storage power stations, and the logic for issuing these commands is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the released active power is greater than or equal to the disturbance power, the active power release command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. ; if < Then, an active power release command is issued to the nearby energy storage power station to release active power. .

[0013] like <0, the power surplus of the region is The system issues an active power absorption command to the energy storage power station, with the following logic: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the active power absorbed is greater than or equal to the disturbance power, the active power absorption command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. ; if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

[0014] Furthermore, this invention also proposes a combined primary frequency regulation control system for fire and energy storage that takes into account the spatiotemporal differences in frequency, comprising: A classification unit is used to determine the location of the monitoring master station in the power grid, and classify the energy storage power stations of the thermal power-storage joint regulation resource station in the power grid based on the location of the monitoring master station; The evaluation unit is used to detect power grid faults based on the characteristic quantities obtained by the monitoring master station node. When a power grid fault occurs, it evaluates the available capacity of the classified energy storage power stations based on the frequency and spatiotemporal differences of the energy storage power stations and obtains the evaluation results. The control unit is used to issue a primary frequency regulation control command to the energy storage power station according to the evaluation results and a preset issuance logic, and to control the energy storage power station based on the primary frequency regulation control command.

[0015] Optionally, the location of the monitoring master station can be determined based on the network topology of the power grid, the distribution of synchronous machines, and the distribution of energy storage power stations.

[0016] Optionally, based on the location of the monitoring master station, the energy storage power stations of the combined thermal and energy storage regulation resource stations in the power grid are classified, including: Based on the location and voltage level of the joint regulation and control resource station, energy storage power stations are classified and their respective monitoring master stations are identified. Among them, the same energy storage power station can be controlled by different monitoring master stations; The affiliation between the monitoring master station and the energy storage power station is determined based on the electrical distance between the energy storage power station and the monitoring master station, and the energy storage power station substations are sorted according to their electrical distance from the monitoring master station.

[0017] Optionally, power grid fault detection can be performed based on the feature quantities obtained from the monitoring master station node, including: Based on characteristic quantities and typical electrical quantity patterns of power grid fault types, short-circuit faults and active power surge faults in the power grid can be distinguished by threshold judgment, feature matching, or logical criteria.

[0018] Optionally, the fault location can be determined based on the voltage and current drop and frequency variation characteristics of the fault node.

[0019] Optionally, depending on whether the voltage or current at the fault node is a step change, if it is not a step change, then an active power disturbance fault occurs in the power grid.

[0020] Optionally, an available capacity assessment can be performed on the categorized energy storage power stations, including: If a short-circuit fault occurs in the power grid, the monitoring master station will not issue any active power release or absorption commands; If an active power disturbance fault occurs in the power grid, the State of Charge (SOC) of the energy storage station is obtained, and the state of the energy storage station is determined based on the SOC. Among them, when the SOC of the energy storage power station is 0%~10%, it is in a state where discharge is prohibited; When the SOC of an energy storage power station is 10% to 90%, it is in a state where it can be charged and discharged. When the SOC of the energy storage power station is 90%~100%, charging is prohibited. If the unbalanced power deficit in the near zone of the monitoring master station is: in, For unbalanced power, Adjustable power; Where: N is the number of generators monitored by the main station, H Gi Here, f is the rated kinetic energy of the generator, and f is the frequency. like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... , like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

[0021] Optionally, according to a preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, including: like >0, the power deficit in the region is The system issues active power release commands to energy storage power stations, and the logic for issuing these commands is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the released active power is greater than or equal to the disturbance power, the active power release command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. ; if < Then, an active power release command is issued to the nearby energy storage power station to release active power. .

[0022] like <0, the power surplus of the region is The system issues an active power absorption command to the energy storage power station, with the following logic: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the active power absorbed is greater than or equal to the disturbance power, the active power absorption command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. ; if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

[0023] In another aspect, the present invention also provides a computing device, comprising: one or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described above is implemented.

[0024] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the method described above.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for combined thermal power and energy storage primary frequency regulation control that takes into account frequency spatiotemporal differences. The method includes: determining the location of a monitoring master station in the power grid, and classifying energy storage power stations within the combined thermal power and energy storage regulation resource stations in the power grid based on the location of the monitoring master station; performing grid fault detection based on characteristic quantities acquired by the monitoring master station nodes; assessing the magnitude of disturbance in the monitoring area based on the frequency change characteristics of the monitoring master station after a grid fault occurs, evaluating the available regulation capacity of the classified energy storage power stations, and obtaining the evaluation results; issuing primary frequency regulation control commands to the energy storage power stations according to the evaluation results and a preset issuance logic, and controlling the energy storage power stations based on the primary frequency regulation control commands. This invention overcomes the limitations of synchronous machine primary frequency regulation response delay, achieving a faster regulation speed at the millisecond level. Attached Figure Description

[0026] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a flowchart of an embodiment of the method of the present invention; Figure 3 This is a structural diagram of the system of the present invention. Detailed Implementation

[0027] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0028] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0029] Example 1: This invention proposes a combined primary frequency regulation control method S100 for fire and energy storage systems that takes into account the spatiotemporal differences in frequency, such as... Figure 1 As shown, it includes: S101, determine the location of the monitoring master station in the power grid, and classify the energy storage power stations of the thermal power-storage joint regulation resource station in the power grid based on the location of the monitoring master station; S102, based on the characteristic quantities obtained by the monitoring master station node, the power grid fault is perceived. When a power grid fault occurs, the magnitude of the disturbance in the monitoring area is evaluated based on the frequency change characteristics of the monitoring master station, the available regulation capacity of the classified energy storage power stations is evaluated, and the evaluation results are obtained. S103, based on the evaluation results and according to the preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, and the energy storage power station is controlled based on the primary frequency regulation control command.

[0030] The location of the monitoring master station is determined based on the network topology of the power grid, the distribution of synchronous machines, and the distribution of energy storage power stations.

[0031] Based on the location of the monitoring master station, the energy storage power stations of the combined thermal and energy storage regulation resource stations in the power grid are classified, including: Based on the location and voltage level of the joint regulation and control resource station, energy storage power stations are classified and their respective monitoring master stations are identified. The affiliation between the monitoring master station and the energy storage power station is determined based on the electrical distance between the energy storage power station and the monitoring master station, and the energy storage power station substations are sorted according to their electrical distance from the monitoring master station.

[0032] Among these, the detection of power grid faults based on the feature quantities obtained from the monitoring master station node includes: Based on characteristic quantities and typical electrical quantity patterns of power grid fault types, short-circuit faults and active power surge faults in the power grid can be distinguished by threshold judgment, feature matching, or logical criteria.

[0033] Among them, the fault location is determined based on the voltage and current drop and frequency change characteristics of the fault node.

[0034] Among them, depending on whether the voltage or current of the fault node is a step change, if it is not a step change, then the power grid has an active power disturbance fault.

[0035] The assessment of the available regulation capacity of classified energy storage power stations includes: If a short-circuit fault occurs in the power grid, the monitoring master station will not issue any active power release or absorption commands; If an active power disturbance fault occurs in the power grid, the State of Charge (SOC) of the energy storage station is obtained, and the state of the energy storage station is determined based on the SOC. Among them, when the SOC of the energy storage power station is 0%~10%, it is in a state where discharge is prohibited; When the SOC of an energy storage power station is 10% to 90%, it is in a state where it can be charged and discharged. When the SOC of the energy storage power station is 90%~100%, charging is prohibited. The above percentages can be adjusted according to the actual situation of the energy storage station.

[0036] If the unbalanced power deficit in the near zone of the monitoring master station is: in, For unbalanced power, Adjustable power; Where: N is the number of generators monitored by the main station, H Gi Here, f is the rated kinetic energy of the generator, and f is the frequency. like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... : like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

[0037] Specifically, according to the preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, including: like >0, the power deficit in the region is The system issues active power release commands to energy storage power stations, and the logic for issuing these commands is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the released active power is greater than or equal to the disturbance power, the active power release command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. ; if < Then, an active power release command is issued to the nearby energy storage power station to release active power. .

[0038] like <0, the power surplus of the region is The system issues an active power absorption command to the energy storage power station, with the following logic: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the active power absorbed is greater than or equal to the disturbance power, the active power absorption command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. ; if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

[0039] The present invention will be further described below with reference to specific embodiments: This invention overcomes the limitations of the frequency regulation response delay of the synchronous machine and takes into account the differences in frequency changes at different nodes of the power grid. By utilizing the differences in frequency changes at different nodes, it can quickly identify the disturbance near zone. At the same time, by combining the state of charge (SOC) of the energy storage near zone, it can calculate the energy storage regulation power in the disturbance near zone, quickly initiate the energy storage charging or discharging command, rapidly compensate for the power deficit in the fault disturbance area, reduce unbalanced power, weaken the differences in frequency changes at different nodes of the power grid, and rapidly improve the frequency stability of the system.

[0040] The main objective of the primary frequency regulation control system of this invention is to overcome the slow response of the synchronous machine, resolve the poor local frequency stability, leverage the role of active power regulation resources such as energy storage, rapidly reduce unbalanced power in the fault-prone area, alleviate transient characteristics after a fault, and improve frequency stability in response to active power disturbances of different levels. The system includes a control master station and a regulating resource energy storage power station. The regulating resource energy storage power station described in this invention is also applicable to other entities with active power regulation capabilities. Specific implementation steps of the invention are as follows: Figure 2 As shown, it specifically includes: Step 1: Determine the location of the monitoring master station. Based on the actual power grid network topology, the distribution of synchronous machines, and the distribution of energy storage power stations, determine the location of the monitoring master station.

[0041] The monitoring master station determines the type of fault disturbance by monitoring key status data such as generator bus voltage and current, distinguishing between short-circuit faults and load variation faults. The monitoring master station monitors the rate of frequency change and frequency deviation, judging the magnitude of nearby active power disturbances based on these indicators. No adjustment commands are issued when a short-circuit fault occurs. Power adjustment commands are sent when a significant active power disturbance occurs.

[0042] Step Two: Classification of Regulation Resource Stations and Energy Storage Stations. A regulation resource station refers to an entity with a certain active power regulation capability. In this invention, it refers to an energy storage station, but this method also applies to other integrated entities with active power regulation capabilities. Regulation resource stations are classified according to their connection location and voltage level, and their control master stations are identified. The same regulation resource station can be controlled by different monitoring master stations, becoming an active power support provider in the vicinity of the monitoring master station. A relationship between monitoring master stations and regulation substations is established based on electrical distance. Regulation substations are sorted according to their electrical distance from the monitoring master station. A table showing the correspondence between monitoring master stations and regulation substations is shown in Table 1. Table 1:

[0043] Step 3: Fault Detection. Based on the electrical quantities (current, voltage, phase, frequency) and other characteristics of the monitoring master station nodes, and combined with the typical electrical quantity patterns of fault types, short-circuit faults and active power change faults are distinguished through threshold judgment, feature matching, and logical criteria.

[0044] Short-circuit fault diagnosis and area classification. Generally, after a short-circuit fault occurs, the voltage at the fault node drops rapidly to zero, while at nodes farther from the fault, the voltage drop is typically no more than 0.8 pu. In terms of current, the fault current is generally very high, even exceeding 5 pu, while the current in the far-fault area is generally less than 2 pu. The distance to the fault is determined based on key electrical quantities such as voltage, current, and frequency, and the monitoring master station is marked with near-fault area, relatively far-fault area, and far-fault area.

[0045] Active power disturbance fault diagnosis and area division. Generally, after an active power disturbance occurs, the voltage change is small, and the current changes slowly rather than abruptly. The frequency deviation is determined based on the specified time series T of the monitoring master station. Rate of change of frequency in time series A frequency-space-time matrix is ​​constructed. Based on the frequency deviation and the rate of frequency change, the unbalanced power of the node can be roughly estimated, and the magnitude of active power disturbance in the vicinity of the monitoring master station can be determined.

[0046] (1) Method for calculating unbalanced power of monitoring master station: Where: N is the number of generators monitored by the main station, H Gi f is the rated kinetic energy of the generator, and f is the frequency.

[0047] Through simulation analysis and active power disturbance calculation, the magnitude of active power disturbance of the monitoring master station and its distance from the fault point are divided by frequency change rate and frequency deviation. For example, the comparison is shown in Table 2. Table 2

[0048] Based on the frequency change rate and the frequency deviation over a specified time T, calculate the magnitude of the unbalanced power in the near-zone of the monitoring master station. The calculated unbalanced power for the monitoring master station area is: The adjustable power of the synchronizer in the monitoring master station area is calculated as follows: This strategy is applicable to disturbances of medium to large magnitude, such as when the frequency change rate is >0.5Hz / s. For general small disturbances, the above control strategy can be activated by the primary frequency regulation of the synchronous machine, power supply, or energy storage itself.

[0049] Step 4: Assessment of available capacity of the energy storage power station at the adjustment resource station: When a short circuit fault occurs, the monitoring master station will not issue any active power release or absorption commands.

[0050] Obtain the State of Charge (SOC) of the energy storage power station to assess its condition. Discharging is prohibited when the SOC is between 0% and 10%. Charging and discharging are permitted when the SOC is between 10% and 90%. Charging is prohibited when the SOC is between 90% and 100%.

[0051] If the unbalanced power deficit in the near zone of the monitoring master station is: (4) Considering that energy storage power stations can absorb or release active power quickly, priority should be given to having energy storage power stations handle unbalanced power and rapidly smooth the system frequency.

[0052] in, For unbalanced power, Adjustable power; Where: N is the number of generators monitored by the main station, H Gi f is the rated kinetic energy of the generator, and f is the frequency.

[0053] like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... , like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

[0054] Step 5: Issuing the instruction: (1) If If the value is greater than 0, then the power deficit in this region is... It is necessary to issue an active power release command to the energy storage power station. The issuing logic is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. The energy storage power stations are selected based on their order of arrangement within the monitoring master station. Priority is given to energy storage power stations ranked higher in the order. Once the released active power is greater than or equal to the disturbance power, the active power release command is no longer issued to subsequent energy storage power stations.

[0055] if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. .

[0056] if < Then, an active power release command is issued to the nearby energy storage power station to release active power. .

[0057] (2) If If the power difference is less than 0, then the power surplus in this region is... It is necessary to issue an active power absorption command to the energy storage power station. The issuing logic is as follows: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. The energy storage power stations are selected based on their order of substations within the monitoring master station. Substations ranked higher in the order are prioritized. Once the absorbed active power is greater than or equal to the disturbance power, active power absorption commands are no longer issued to subsequent energy storage power stations.

[0058] if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

[0059] if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

[0060] Step Six: Verification and Correction of Control Strategy Effectiveness Construct an offline power grid simulation system. Set up a monitoring master station and regulating energy storage stations under the monitoring master station according to steps (1)-(5). Evaluate the electrical distance of each energy storage station relative to the monitoring master station. Sort the energy storage stations according to the electrical distance of the substations relative to the monitoring master station. Set the frequency change rate and frequency deviation start value. When the frequency change rate or frequency deviation of the monitoring master station exceeds the start value, issue a power absorption or release command to the energy storage station. Establish active power disturbance faults with different short-circuit faults and different disturbance magnitudes. Test the effect of the above settings and methods. Correct the settings based on offline test experience.

[0061] The implementation of this invention has the following advantages and effects: It overcomes the limitation of the frequency modulation response delay of the synchronous machine, and the adjustment speed is faster, reaching the millisecond level.

[0062] Considering the differences in frequency variations at different nodes of the power grid, it can quickly identify disturbance areas and calculate unbalanced power, achieving rapid active power compensation.

[0063] Rapid and accurate disturbance source localization and power compensation mechanisms can effectively suppress frequency fluctuations, effectively reduce frequency deviations between system nodes, and maintain network-wide frequency consistency.

[0064] Example 2: Furthermore, this invention also proposes a combined primary frequency regulation control system 200 for fire and energy storage that takes into account the spatiotemporal differences in frequency, such as... Figure 3 As shown, it includes: The classification unit 201 is used to determine the location of the monitoring master station in the power grid, and classify the energy storage power stations of the thermal power-storage joint regulation resource station in the power grid based on the location of the monitoring master station. The evaluation unit 202 is used to perceive power grid faults based on the characteristic quantities obtained by the monitoring master station node. When a power grid fault occurs, it evaluates the magnitude of active power disturbance in the monitoring area based on the frequency change characteristics of the generator node of the monitoring master station, and evaluates the regulation capability of the energy storage power station, and obtains the evaluation results. The control unit 203 is used to issue a primary frequency regulation control command to the energy storage power station according to the evaluation results and a preset issuance logic, and to control the energy storage power station based on the primary frequency regulation control command.

[0065] The location of the monitoring master station is determined based on the network topology of the power grid, the distribution of synchronous machines, and the distribution of energy storage power stations.

[0066] Based on the location of the monitoring master station, the energy storage power stations of the combined thermal and energy storage regulation resource stations in the power grid are classified, including: Based on the location and voltage level of the joint regulation and control resource station, energy storage power stations are classified and their respective monitoring master stations are identified. Among them, the same energy storage power station can be controlled by different monitoring master stations; The affiliation between the monitoring master station and the energy storage power station is determined based on the electrical distance between the energy storage power station and the monitoring master station, and the energy storage power station substations are sorted according to their electrical distance from the monitoring master station.

[0067] Among these, the detection of power grid faults based on the feature quantities obtained from the monitoring master station node includes: Based on characteristic quantities and typical electrical quantity patterns of power grid fault types, short-circuit faults and active power surge faults in the power grid can be distinguished by threshold judgment, feature matching, or logical criteria.

[0068] Among them, the fault location is determined based on the voltage and current drop and frequency change characteristics of the fault node.

[0069] Among them, depending on whether the voltage or current of the fault node is a step change, if it is not a step change, then the power grid has an active power disturbance fault.

[0070] The assessment of the regulation capacity of classified energy storage power stations includes: If a short-circuit fault occurs in the power grid, the monitoring master station will not issue any active power release or absorption commands; If an active power disturbance fault occurs in the power grid, the State of Charge (SOC) of the energy storage station is obtained, and the state of the energy storage station is determined based on the SOC. Among them, when the SOC of the energy storage power station is 0%~10%, it is in a state where discharge is prohibited; When the SOC of an energy storage power station is 10% to 90%, it is in a state where it can be charged and discharged. When the SOC of the energy storage power station is 90%~100%, charging is prohibited. If the unbalanced power deficit in the near zone of the monitoring master station is: in, For unbalanced power, Adjustable power; Where: N is the number of generators monitored by the main station, H Gi Here, f is the rated kinetic energy of the generator, and f is the frequency. like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... : like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

[0071] Specifically, according to the preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, including: like >0, the power deficit in the region is The system issues active power release commands to energy storage power stations, and the logic for issuing these commands is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the released active power is greater than or equal to the disturbance power, the active power release command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. ; if < Then, an active power release command is issued to the nearby energy storage power station to release active power. .

[0072] like <0, the power surplus of the region is The system issues an active power absorption command to the energy storage power station, with the following logic: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the active power absorbed is greater than or equal to the disturbance power, the active power absorption command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. ; if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

[0073] The implementation of this invention overcomes the limitation of the frequency modulation response delay of the synchronous machine, and the adjustment speed is faster, reaching the millisecond level.

[0074] Example 3: Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby implementing the steps of the methods in the above embodiments.

[0075] Example 4: Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiments.

[0076] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0077] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0078] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0079] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0080] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0081] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for combined primary frequency regulation control of thermal power and energy storage systems, taking into account the spatiotemporal differences in frequency, characterized in that, include: The location of the monitoring master station in the power grid is determined, and based on the location of the monitoring master station, the energy storage power stations of the thermal power-storage joint regulation resource station in the power grid are classified. Power grid fault perception is performed based on the characteristic quantities obtained from the monitoring master station node. When a power grid fault occurs, the active power disturbance is evaluated based on the frequency change characteristics of the master station generator, and the regulation capability of the energy storage power station is evaluated, and the evaluation results are obtained. Based on the evaluation results and according to the preset distribution logic, a primary frequency regulation control command is issued to the energy storage power station, and the energy storage power station is controlled based on the primary frequency regulation control command.

2. The combined primary frequency regulation control method for thermal power and energy storage according to claim 1, characterized in that, The location of the monitoring master station is determined based on the network topology of the power grid, the distribution of synchronous machines, and the distribution of energy storage power stations.

3. The combined primary frequency regulation control method for thermal power and energy storage according to claim 1, characterized in that, Based on the location of the monitoring master station, the energy storage power stations of the combined thermal and energy storage regulation resource stations in the power grid are classified, including: Based on the location and voltage level of the regulating resource station, the energy storage power stations are classified and their respective monitoring master stations are identified. The affiliation between the monitoring master station and the energy storage power station is determined based on the electrical distance between the energy storage power station and the monitoring master station, and the energy storage power station substations are sorted according to their electrical distance from the monitoring master station.

4. The combined primary frequency regulation control method for thermal power and energy storage according to claim 1, characterized in that, Power grid fault detection is performed based on the characteristic quantities obtained from the monitoring master station node, including: Based on characteristic quantities and typical electrical quantity patterns of power grid fault types, short-circuit faults and active power surge faults in the power grid can be distinguished by threshold judgment, feature matching, or logical criteria.

5. The combined primary frequency regulation control method for thermal power and energy storage according to claim 4, characterized in that, The fault location can be determined based on the voltage and current drops and frequency variation characteristics of the fault node.

6. The combined primary frequency regulation control method for thermal power and energy storage according to claim 4, characterized in that, Depending on whether the voltage or current at the fault node is a step change, if it is not a step change, then an active power disturbance fault has occurred in the power grid.

7. The combined primary frequency regulation control method for thermal power and energy storage according to claim 1, characterized in that, The assessment of the available regulation capacity of the classified energy storage power stations includes: If a short-circuit fault occurs in the power grid, the monitoring master station will not issue any active power release or absorption commands; If an active power disturbance fault occurs in the power grid, the State of Charge (SOC) of the energy storage station is obtained, and the state of the energy storage station is determined based on the SOC. Among them, when the SOC of the energy storage power station is 0%~10%, it is in a state where discharge is prohibited; When the SOC of an energy storage power station is 10% to 90%, it is in a state where it can be charged and discharged. When the SOC of the energy storage power station is 90%~100%, charging is prohibited. If the unbalanced power deficit in the near zone of the monitoring master station is: in, For unbalanced power, To monitor the standby power of all generators at the main station, the method for calculating the unbalanced power in the monitoring area is as follows: Where: N is the number of generators monitored by the main station, H Gi Here, f is the rated kinetic energy of the generator, and f is the frequency. like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... : like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

8. The combined primary frequency regulation control method for thermal power and energy storage according to claim 1, characterized in that, The step of issuing a primary frequency regulation control command to the energy storage power station according to a preset issuing logic includes: like >0, the power deficit in the region is The system issues active power release commands to energy storage power stations, and the logic for issuing these commands is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the released active power is greater than or equal to the disturbance power, the active power release command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. ; if < Then, an active power release command is issued to the nearby energy storage power station to release active power. . like <0, the power surplus of the region is The system issues an active power absorption command to the energy storage power station, with the following logic: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the active power absorbed is greater than or equal to the disturbance power, the active power absorption command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. ; if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

9. A combined primary frequency regulation control system for thermal power generation and energy storage considering frequency spatiotemporal differences, characterized in that, include: A classification unit is used to determine the location of the monitoring master station in the power grid, and classify the energy storage power stations of the regulating resource stations in the power grid based on the location of the monitoring master station; The evaluation unit is used to detect power grid faults based on the characteristic quantities obtained by the monitoring master station. When a power grid fault occurs, it evaluates the magnitude of active power disturbance in the monitoring area based on the frequency change characteristics of the master station generator, evaluates the regulation capacity of the regulation resource station and energy storage station, and obtains the evaluation results. The control unit is used to issue a primary frequency regulation control command to the energy storage power station according to the evaluation results and a preset issuance logic, and to control the energy storage power station based on the primary frequency regulation control command.

10. The combined primary frequency regulation control system for thermal power generation and energy storage according to claim 9, characterized in that, The location of the monitoring master station is determined based on the network topology of the power grid, the distribution of synchronous machines, and the distribution of energy storage power stations.

11. The combined primary frequency regulation control system for thermal power generation and energy storage according to claim 9, characterized in that, The classification of energy storage power stations in the power grid's regulating resource stations based on the location of the monitoring master station includes: Based on the location and voltage level of the regulating resource station, the energy storage power stations are classified and their respective monitoring master stations are identified. The affiliation between the monitoring master station and the energy storage power station is determined based on the electrical distance between the energy storage power station and the monitoring master station, and the energy storage power station substations are sorted according to their electrical distance from the monitoring master station.

12. The combined primary frequency regulation control system for thermal power generation and storage according to claim 9, characterized in that, Power grid fault detection is performed based on the characteristic quantities obtained from the monitoring master station node, including: Based on characteristic quantities and typical electrical quantity patterns of power grid fault types, short-circuit faults and active power surge faults in the power grid can be distinguished by threshold judgment, feature matching, or logical criteria.

13. The combined primary frequency regulation control system for thermal power generation and energy storage according to claim 12, characterized in that, The fault location can be determined based on the voltage and current drop and frequency change characteristics of the fault node.

14. The combined primary frequency regulation control system for thermal power generation and storage according to claim 12, characterized in that, Depending on whether the voltage or current at the fault node is a step change, if it is not a step change, then an active power disturbance fault has occurred in the power grid.

15. The combined primary frequency regulation control system for thermal power generation and storage according to claim 9, characterized in that, The assessment of available capacity for the categorized energy storage power stations includes: If a short-circuit fault occurs in the power grid, the monitoring master station will not issue any active power release or absorption commands; If an active power disturbance fault occurs in the power grid, the State of Charge (SOC) of the energy storage station is obtained, and the state of the energy storage station is determined based on the SOC. Among them, when the SOC of the energy storage power station is 0%~10%, it is in a state where discharge is prohibited; When the SOC of an energy storage power station is 10% to 90%, it is in a state where it can be charged and discharged. When the SOC of the energy storage power station is 90%~100%, charging is prohibited. If the unbalanced power deficit in the near zone of the monitoring master station is: in, For unbalanced power, Adjustable power; Where: N is the number of generators monitored by the main station, H Gi Here, f is the rated kinetic energy of the generator, and f is the frequency. like If the value is greater than 0, then the energy storage power station needs to release active power, and the discharge power of the energy storage power station is... : like If the value is less than 0, then the energy storage power station needs to absorb active power. The available active power capacity of the energy storage power station is calculated as follows: like If the value is less than 0, then the energy storage power station needs to absorb active power, and the charging power of the energy storage power station is... The calculation is as follows: For a single energy storage power station: Where S is the capacity of the energy storage power station, SOC is the state of charge of the energy storage power station, and T is the charging and discharging time.

16. The combined primary frequency regulation control method for thermal power and energy storage according to claim 9, characterized in that, The step of issuing a primary frequency regulation control command to the energy storage power station according to a preset issuing logic includes: like >0, the power deficit in the region is The system issues active power release commands to energy storage power stations, and the logic for issuing these commands is as follows: if > Then, an active power release command is issued to the nearby energy storage power station to release active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the released active power is greater than or equal to the disturbance power, the active power release command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power release command is issued to the nearby energy storage power station to release active power. ; if < Then, an active power release command is issued to the nearby energy storage power station to release active power. . like <0, the power surplus of the region is The system issues an active power absorption command to the energy storage power station, with the following logic: if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. And based on the order of the energy storage power station substations included in the monitoring master station, the energy storage power station is selected in the best order, including: prioritizing the energy storage power station substations with higher order; when the active power absorbed is greater than or equal to the disturbance power, the active power absorption command will no longer be issued to the subsequent energy storage power stations. if < < Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. ; if > Then, an active power absorption command is issued to the nearby energy storage power station to absorb active power. .

17. A computer device, characterized in that, include: One or more processors; A processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method described in any one of claims 1-8 is implemented.

18. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the method as described in any one of claims 1-8.

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